Refunds are well catered for on Expense transactions, but I cannot see how to do refunds on income.
Income from eBay or other 'sales' occasionally has to be refunded, either in part or in whole. This should be possible by selecting the Income transaction and selecting a refund, in just the same way as is done with Expense transactions.
Or am I missing something?
I'm afraid that it's not currently possible to refund an income transaction. I've moved your topic to Feature Requests forum so that we can allow more users to vote on this idea.